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South Korean Foreign Minister Yun Byung-Se, speaks during a news conference with U.S. Secretary of State John Kerry, not pictured, at the State Department in Washington, on Tuesday, April 2, 2013. (AP Photo/Jacquelyn Martin)

South Korean Foreign Minister Yun Byung-Se, speaks during a news conference with U.S. Secretary of State John Kerry, not pictured, at the State Department in Washington, on Tuesday, April 2, 2013. (AP Photo/Jacquelyn Martin)